Semiconductor device for controlling supply of driving signals

a technology of magnetic field and driving signal, which is applied in the direction of pulse automatic control, dc motor rotation control, pulse technique, etc., can solve the problems of increasing power loss in output transistors, reducing the amount of power consumption in the power supply circuit, and reducing the power consumption. , to achieve the effect of reducing power consumption

US20090224818A1Inactive Publication Date: 2009-09-10SEIKO EPSON CORP
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
Publication Date
2009-09-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

A driving signal supply control semiconductor device includes a load driving device that includes: (i) a bridge circuit including a high-side first transistor and a low-side second transistor, the transistors being electrically connected to a load as an object to be driven and being turned on or off to energize or de-energize the load; (ii) a first driving circuit driving the first transistor; (iii) a second driving circuit driving the second transistor; (iv) a first power supply circuit supplying driving power to the first driving circuit; (v) a second power supply circuit supplying driving power to the second driving circuit; (vi) a supply content setting unit setting a supply content of each of driving signals regarding low-power driving of the load driving device, according to a standby status of the load; and (vii) a driving signal supply control unit controlling supply of the driving signals to the first and the second power supply circuits. Based on the supply content set by the supply content setting unit, the driving signal supply control unit controls independently contents of the driving signals supplied to each of the first and the second power supply circuits such that the load driving device is driven with lower power consumption than in a normal driving status of the load driving device.
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Description

BACKGROUND

[0001] 1. Technical Field

[0002] The present invention relates to a driving signal supply control

[0003] semiconductor device suitable to reduce the amount of power consumption of a constant voltage power supply circuit used when driving a driving device that includes a bridge circuit driving a load such as a motor.

[0004] 2. Related Art

[0005] Conventionally, as circuits driving a load such as a motor, there are

[0006] known as a half-bridge circuit, a full-bridge circuit, and the like. Those circuits include a high-potential-side (high-side) transistor and a low-potential-side (low-side) transistor. The high-side and the low-side transistors are independently controlled to be driven so as to be turned on or off, thereby energizing or de-energizing the load.

[0007] Additionally, a load requiring a relatively high power for high-speed switching operation uses metal-oxide-semiconductor field-effect transistors (MOSFETs) designed for high-current applications, as transistors included in ...

Examples

Embodiment Construction

[0082]Embodiments of the invention will be described with reference to the drawings. FIGS. 1 to 9 are diagrams showing a driving signal supply control semiconductor device according to an embodiment of the invention.

[0083]In the present embodiment, a motor driving device is applied to the driving signal supply control semiconductor device of the embodiment. The motor driving device includes an H-bridge circuit that controls driving of the motor.

[0084]First, a structure of a motor driving device 1 according to the embodiment will be described with reference to FIG. 1. FIG. 1 is a block diagram showing a structure of the motor driving device 1.

[0085]As shown in FIG. 1, the motor driving device 1 includes a control circuit 10, a driving signal supply control circuit 20, a power supply circuit 30, a transistor driving circuit 40, an H-bridge circuit 50, and a current detecting circuit 60.

[0086]The control circuit 10 includes a serial interface circuit to be connected to an external micr...